package com.fanvil.videoconference;


import android.graphics.RectF;
import android.opengl.GLES20;
import android.util.Log;

import android.annotation.SuppressLint;
import android.graphics.RectF;
import android.graphics.SurfaceTexture;
import android.opengl.GLES11Ext;
import android.opengl.GLES20;
import android.opengl.Matrix;
import android.os.Looper;
import android.util.Log;
import android.util.Pair;
import android.util.Size;
import android.view.Surface;

//import androidx.media.filterfw.geometry.Quad;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.util.Arrays;
import java.util.HashMap;

public class FvlTextureRenderer {
    private static FvlLogger sLogger =
        FvlLogger.getLogger(FvlTextureRenderer.class.getSimpleName(), FvlLogger.DEBUG);

    private static final int FLOAT_SIZE_BYTES = 4;
    private static final int TRIANGLE_VERTICES_DATA_STRIDE_BYTES = 5 * FLOAT_SIZE_BYTES;
    private static final int TRIANGLE_VERTICES_DATA_POS_OFFSET = 0;
    private static final int TRIANGLE_VERTICES_DATA_UV_OFFSET = 3;
    private final float[] mTriangleVerticesData = {
            // X, Y, Z, U, V
            -1.0f, -1.0f, 0, 0.f, 0.f,
            1.0f, -1.0f, 0, 1.f, 0.f,
            -1.0f,  1.0f, 0, 0.f, 1.f,
            1.0f,  1.0f, 0, 1.f, 1.f,
    };

    private FloatBuffer mTriangleVertices;

    private static final String VERTEX_SHADER =
            "uniform mat4 uMVPMatrix;\n" +
                    "uniform mat4 uSTMatrix;\n" +
                    "attribute vec4 aPosition;\n" +
                    "attribute vec4 aTextureCoord;\n" +
                    "varying vec2 vTextureCoord;\n" +
                    "void main() {\n" +
                    "  gl_Position = uMVPMatrix * aPosition;\n" +
                    "  vTextureCoord = (uSTMatrix * aTextureCoord).xy;\n" +
                    "}\n";

    private static final String FRAGMENT_SHADER =
            "#extension GL_OES_EGL_image_external : require\n" +
                    "precision mediump float;\n" +      // highp here doesn't seem to matter
                    "varying vec2 vTextureCoord;\n" +
                    "uniform samplerExternalOES sTexture;\n" +
                    "void main() {\n" +
                    "  gl_FragColor = texture2D(sTexture, vTextureCoord);\n" +
                    "}\n";

    private float[] mMVPMatrix = new float[16];
    private float[] mSTMatrix = new float[16];


    public static final int VIEW_ROLE_INVALID = -1;
    public static final int VIEW_ROLE_LOCAL = 0;
    public static final int VIEW_ROLE_REMOTE = 1;

    private static final int LANDSCAPE = 0;
    private static final int PORTRAIT = 1;

    private int mViewRole = 1;
    private int mViewWidth = 1280;
    private int mViewHeight = 800;
    private int mVideoWidth = 1920;//1280;//1920;
    private int mVideoHeight = 1080;//720;//1080;
    private boolean mUpdateMatrix = false;

    private String mName = null;

    private int mProgram;
    private int mTextureID = -12345;
    private int mVboId = -12345;
    private int muMVPMatrixHandle;
    private int muSTMatrixHandle;
    private int maPositionHandle;
    private int maTextureHandle;


    private FvlVideoLayout mVideoLayout = null;

    private int mBaseTexUnit = GLES20.GL_TEXTURE0;

    public FvlTextureRenderer() {
        sLogger.d("FvlTextureRenderer create");
        init();
        setup();
    }

    public void setVideoSize(int videoW, int videoH) {
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] setVideoSize: " + videoW + "X" + videoH);
        mVideoWidth = videoW;
        mVideoHeight = videoH;
        mUpdateMatrix = true;
    }

    public void setViewSize(int viewW, int viewH) {
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] setViewSize: " + viewW + "X" + viewH);
        mViewWidth = viewW;
        mViewHeight = viewH;
        mUpdateMatrix = true;
    }

    public void setViewRole(int role) {
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] setViewRole: " + role);
        mViewRole = role;
        mUpdateMatrix = true;
    }

    public void process(int mode, SurfaceTexture st, FvlTextureSource texture, FvlRenderTarget target, int width, int height) {
        sLogger.d("process: mode =" + mode);
        sLogger.d("process: SurfaceTexture =" + st);
        sLogger.d("process: FvlTextureSource =" + texture);
        sLogger.d("process: FvlRenderTarget =" + target);
        sLogger.d("process: width =" + width + " height=" + height);
        processMulti(mode, st, new FvlTextureSource[] { texture }, new FvlRenderTarget[] { target }, width, height);
    }

    public void processMulti(int mode, SurfaceTexture st, FvlTextureSource[] sources, FvlRenderTarget[]  targets, int width, int height) {
        sLogger.d("processMulti");
        FvlGLToolbox.checkGlError("Unknown Operation");
        checkExecutable();
        st.getTransformMatrix(mSTMatrix);
        focusTarget(mode, targets[0], width, height);
        pushShaderState(sources);
        render();
    }

    public void setBaseTextureUnit(int baseTexUnit) {
        mBaseTexUnit = baseTexUnit;
    }
    public int baseTextureUnit() {
        return mBaseTexUnit;
    }

    public String inputTextureUniformName(int index) {
        return "tex_sampler_" + index;
    }

    public static int maxTextureUnits() {
        return GLES20.GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS;
    }

    private void useVboDraw() {
        GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, mVboId);
        GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false,
                5 * FLOAT_SIZE_BYTES, TRIANGLE_VERTICES_DATA_POS_OFFSET);
        checkGlError("glVertexAttribPointer maPosition");

        GLES20.glVertexAttribPointer(maTextureHandle, 2, GLES20.GL_FLOAT, false,
                5 * FLOAT_SIZE_BYTES, TRIANGLE_VERTICES_DATA_UV_OFFSET * FLOAT_SIZE_BYTES);
        checkGlError("glVertexAttribPointer maTextureHandle");

        GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
    }

    protected void pushShaderState(FvlTextureSource[] sources) {
        sLogger.d("pushShaderState");
        useProgram();
        /*updateSourceCoordAttribute();
        updateTargetCoordAttribute();
        pushAttributes();
        if (mClearsOutput) {
            GLES20.glClearColor(mClearColor[0], mClearColor[1], mClearColor[2], mClearColor[3]);
            GLES20.glClear(mClearBuffers);
        }
        if (mBlendEnabled) {
            GLES20.glEnable(GLES20.GL_BLEND);
            GLES20.glBlendFunc(mSFactor, mDFactor);
        } else {
            GLES20.glDisable(GLES20.GL_BLEND);
        }*/

        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        sources[0].bind();

        GLES20.glEnableVertexAttribArray(maPositionHandle);
        checkGlError("glEnableVertexAttribArray maPositionHandle");

        GLES20.glEnableVertexAttribArray(maTextureHandle);
        checkGlError("glEnableVertexAttribArray maTextureHandle");

        useVboDraw();

        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
        GLES20.glUniformMatrix4fv(muSTMatrixHandle, 1, false, mSTMatrix, 0);

        FvlGLToolbox.checkGlError("Set render variables");
    }

    private void focusTarget(int mode, FvlRenderTarget target, int width, int height) {
        sLogger.d("focusTarget");
        GLES20.glViewport(0, 0, width, height);
        FvlGLToolbox.checkGlError("glViewport");
        updateRatio(mode, width, height, 1920, 1080);
    }

        private void bindInputTextures(FvlTextureSource[] sources) {
        for (int i = 0; i < sources.length; ++i) {
            // Activate texture unit i
            GLES20.glActiveTexture(baseTextureUnit() + i);

            // Bind texture
            sources[i].bind();

            // Assign the texture uniform in the shader to unit i
            int texUniform = GLES20.glGetUniformLocation(mProgram, inputTextureUniformName(i));
            if (texUniform >= 0) {
                GLES20.glUniform1i(texUniform, i);
            } else {
                throw new RuntimeException("Shader does not seem to support " + sources.length
                    + " number of input textures! Missing uniform " + inputTextureUniformName(i)
                    + "!");
            }
            FvlGLToolbox.checkGlError("Binding input texture " + i);
        }
    }

    private void render() {
        sLogger.d("render");
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
        FvlGLToolbox.checkGlError("glDrawArrays");
        GLES20.glFinish();
    }

    private void checkExecutable() {
        sLogger.d("checkExecutable");
        if (mProgram == 0) {
            throw new RuntimeException("Attempting to execute invalid shader-program!");
        }
    }

    private void useProgram() {
        sLogger.d("useProgram");
        GLES20.glUseProgram(mProgram);
        FvlGLToolbox.checkGlError("glUseProgram");
    }

    private static void checkTexCount(int count) {
        if (count > maxTextureUnits()) {
            throw new RuntimeException("Number of textures passed (" + count + ") exceeds the "
                + "maximum number of allowed texture units (" + maxTextureUnits() + ")!");
        }
    }

    private static int loadShader(int shaderType, String source) {
        int shader = GLES20.glCreateShader(shaderType);
        if (shader != 0) {
            GLES20.glShaderSource(shader, source);
            GLES20.glCompileShader(shader);
            int[] compiled = new int[1];
            GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
            if (compiled[0] == 0) {
                String info = GLES20.glGetShaderInfoLog(shader);
                GLES20.glDeleteShader(shader);
                shader = 0;
                throw new RuntimeException("Could not compile shader " + shaderType + ":" + info);
            }
        }
        return shader;
    }

    private static int createProgram(String vertexSource, String fragmentSource) {
        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
        if (vertexShader == 0) {
            throw new RuntimeException("Could not create shader-program as vertex shader "
                + "could not be compiled!");
        }
        int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
        if (pixelShader == 0) {
            throw new RuntimeException("Could not create shader-program as fragment shader "
                + "could not be compiled!");
        }

        int program = GLES20.glCreateProgram();
        if (program != 0) {
            GLES20.glAttachShader(program, vertexShader);
            FvlGLToolbox.checkGlError("glAttachShader");
            GLES20.glAttachShader(program, pixelShader);
            FvlGLToolbox.checkGlError("glAttachShader");
            GLES20.glLinkProgram(program);
            int[] linkStatus = new int[1];
            GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
            if (linkStatus[0] != GLES20.GL_TRUE) {
                String info = GLES20.glGetProgramInfoLog(program);
                GLES20.glDeleteProgram(program);
                program = 0;
                throw new RuntimeException("Could not link program: " + info);
            }
        }

        GLES20.glDeleteShader(vertexShader);
        GLES20.glDeleteShader(pixelShader);

        return program;
    }

    private void init() {
        sLogger.d("init");
        mTriangleVertices = ByteBuffer.allocateDirect(
                mTriangleVerticesData.length * FLOAT_SIZE_BYTES)
                .order(ByteOrder.nativeOrder()).asFloatBuffer();
        mTriangleVertices.put(mTriangleVerticesData).position(0);

        Matrix.setIdentityM(mSTMatrix, 0);

        mVideoLayout = FvlVideoLayout.getInstance();
    }

    /**
     * Initializes GL state.  Call this after the EGL surface has been created and made current.
     */
    private void setup() {
        sLogger.d("setup");

        mProgram = createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
        if (mProgram == 0) {
            throw new RuntimeException("failed creating program");
        }
        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "aPosition");
        checkGlError("glGetAttribLocation aPosition");
        if (maPositionHandle == -1) {
            throw new RuntimeException("Could not get attrib location for aPosition");
        }
        maTextureHandle = GLES20.glGetAttribLocation(mProgram, "aTextureCoord");
        checkGlError("glGetAttribLocation aTextureCoord");
        if (maTextureHandle == -1) {
            throw new RuntimeException("Could not get attrib location for aTextureCoord");
        }

        muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
        checkGlError("glGetUniformLocation uMVPMatrix");
        if (muMVPMatrixHandle == -1) {
            throw new RuntimeException("Could not get attrib location for uMVPMatrix");
        }

        muSTMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uSTMatrix");
        checkGlError("glGetUniformLocation uSTMatrix");
        if (muSTMatrixHandle == -1) {
            throw new RuntimeException("Could not get attrib location for uSTMatrix");
        }
    }

    public void bindVbo(int vboId) {
        mVboId = vboId;
        FvlGLToolbox.setVboFloats(vboId, mTriangleVerticesData);
    }

    public void release() {
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] release");
        if (mProgram != 0) {
            GLES20.glDeleteProgram(mProgram);
            mProgram = 0;
        }
    }

    public void checkGlError(String op) {
        int error;
        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
            if(sLogger.isLoggable()) sLogger.e(op + ": glError " + error);
            throw new RuntimeException(op + ": glError " + error);
        }
    }

    /**
     * Make sure we are not operating in the UI thread.
     *
     * It is often tricky to track down bugs that happen when issuing GL commands in the UI thread.
     * This is especially true when releasing GL resources. Often this will cause errors much later
     * on. Therefore we make sure we do not do these dangerous operations on the UI thread.
     */
    private void assertNonUiThread(String operation) {
        if (Looper.getMainLooper().getThread() == Thread.currentThread()) {
            throw new RuntimeException("Attempting to perform GL operation '" + operation
                    + "' on UI thread!");
        }
    }

    private void updateRatio(int mode, int viewWidth, int viewHeight, int videoWidth, int videoHeight) {
        float widthRatio = 1.0f;
        float heightRatio = 1.0f;
        int orientation = LANDSCAPE;
        Pair<Float, Float> videoRatio;

        if (viewWidth <= 0 || viewHeight <= 0 || videoWidth <= 0 || videoHeight <= 0) {
            sLogger.e("[" + mName + "] updateRatio: invalid size  viewWidth=" + viewWidth + " viewHeight=" + viewHeight
                     + " videoWidth=" + videoWidth + " videoHeight=" + videoHeight);
            return;
        }

        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] updateRatio VideoSize=" + videoWidth + "X" + videoHeight);
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] updateRatio ViewSize=" + viewWidth + "X" + viewHeight);
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] updateRatio WidthRatio=" + widthRatio
                + " HeightRatio=" + heightRatio);

        videoRatio = mVideoLayout.getVideoRatio(mViewRole, mViewWidth, mViewHeight, mVideoWidth, mVideoHeight);
        if (videoRatio != null) {
            widthRatio = videoRatio.first;
            heightRatio = videoRatio.second;
            if (sLogger.isLoggable()) sLogger.v("[" + mName + "] updateRatio WidthRatio=" + widthRatio
                    + " HeightRatio=" + heightRatio);
            orientation = viewWidth > viewHeight ? LANDSCAPE : PORTRAIT;
            orthoMatrix(widthRatio, heightRatio, orientation);

            if (mode == 0) {//左大窗口
                translateMatrix(-0.15f, 0.0f, widthRatio, heightRatio);
                scaleMatrix(0.75f, 0.75f);
            } else if (mode == 1) {//右上小窗口
                translateMatrix(0.35f, -0.3f, widthRatio, heightRatio);
                scaleMatrix(0.3f, 0.3f);
            } else if (mode == 2) {//右下小窗口
                translateMatrix(0.35f, 0.05f, widthRatio, heightRatio);
                scaleMatrix(0.3f, 0.3f);
            } else if (mode == 3) {//左全屏
                translateMatrix(-0.0f, 0.0f, widthRatio, heightRatio);
                scaleMatrix(1.2f, 1.2f);
            } else if (mode == 4) {//平分左侧
                translateMatrix(-0.15f, 0.0f, widthRatio, heightRatio);
                scaleMatrix(0.5f, 0.5f);
            } else if (mode == 5) {//平分右侧
                translateMatrix(0.3f, 0.0f, widthRatio, heightRatio);
                scaleMatrix(0.5f, 0.5f);
            }
        }
    }

    public void translateMatrix(float dx, float dy, float widthRatio, float heightRatio) {
        sLogger.i("translate: dx=" + dx + " dy=" + dy);
        Matrix.translateM(mMVPMatrix, 0, dx*widthRatio*2, -dy*heightRatio*2, 0f);
    }

    private void scaleMatrix(float sx, float sy) {
        sLogger.i("[" + mName + "] scaleMatrix sx=" + sx + " sy=" + sy);
        Matrix.scaleM(mMVPMatrix, 0, sx, sy, 1f);
    }

    private void orthoMatrix(float widthRatio, float heightRatio, int orientation) {
        float[] projectMatrix = new float[] {
                1, 0, 0, 0,
                0, 1, 0, 0,
                0, 0, 1, 0,
                0, 0, 0, 1,
        };

        float[] viewMatrix = new float[16];

        Matrix.setIdentityM(projectMatrix, 0);
        if (sLogger.isLoggable()) sLogger.v("[" + mName + "] orthoMatrix WidthRatio=" + widthRatio
                + " HeightRatio=" + heightRatio + " Orientation=" + orientation);
        if(orientation == LANDSCAPE) {
            Matrix.orthoM(projectMatrix, 0, -widthRatio,widthRatio, -1,1, 3, 7);
        } else if (orientation == PORTRAIT) {
            Matrix.orthoM(projectMatrix, 0, -1, 1, -heightRatio, heightRatio,3, 7);
        }

        Matrix.setIdentityM(viewMatrix, 0);
        Matrix.setLookAtM(viewMatrix, 0, 0, 0, 7.0f, 0f, 0f, 0f, 0f, 1.0f, 0.0f);

        Matrix.setIdentityM(mMVPMatrix, 0);
        Matrix.multiplyMM(mMVPMatrix,0,projectMatrix,0,viewMatrix,0);
    }
}

